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Jul 23 '12 at 21:41 comment added BornToCode Thank you for giving a practical example because this helps me understand the most. I do have to save detailed sales history, but even if I make a separate products table it won't help, because they deliver to the customers few times a week, the products info is to know how much to charge the customer (each customer has special price). After every purchase I save the details in a special 'Sales_History' table. About your assumption - it's half true. it is a small shop, but they do want many various reports (highest sale, total profit etc. etc.)
Jul 23 '12 at 13:08 history answered billinkc CC BY-SA 3.0